The weak point of a brain-signal cap is where it touches the head. Conventional caps press hard electrodes against the scalp through conductive gel, and once the gel dries the signal fades. A team based mainly at Guangxi University in southern China has built an electrode that, fitted into a commercial EEG cap, kept recording cleanly for more than 14 hours at rest and more than 8 hours through walking, eating, reading and sleeping.
What the team built
The paper, published in npj Flexible Electronics on 31 October, describes what the authors call a skin-mimetic adaptive gradient electrode. The design borrows the graded, layered structure of human skin. The hydrogel sets in a temperature gradient, so it ends up soft at the end that touches the scalp and firm at the end that connects to the circuit. The same process leaves a graded pore structure that releases electrolyte slowly, which the authors link to stable recording over many hours.
Rigid electrodes, and electrodes that are uniformly soft, both fit the scalp poorly, the authors write, which causes motion artefacts and short operating times.
What the tests showed
The team fitted the electrodes into a commercial EEG cap that recorded from eight channels and sent the signals wirelessly to a computer. In typing tasks, eight volunteers entered digits and dates by focusing on flashing characters on a screen. Across the long recordings, the authors report typing accuracy above 94%. In the 8-hour test, the cap kept recording through walking, eating, reading and sleeping.
The researchers have named early warning of epileptic seizures as one possible use. No tests in people with epilepsy have been reported.
The 23 authors come mainly from Guangxi University, with co-authors at Wuming Hospital of Guangxi Medical University, Tsinghua University, Sichuan University and the Leibniz Institute for Neurobiology in Magdeburg, Germany. The corresponding authors are Sen Lin of Guangxi University and the Chongqing Institute for Brain and Intelligence, Hui Wu of Tsinghua and Jianfeng Zhang of Wuming Hospital. The work was funded by the National Natural Science Foundation of China, a research grant from Wuming Hospital and a Sichuan University fund. The authors declare no competing interests.
Signal: Why it matters
Wear time decides whether a non-invasive brain-computer interface can leave the lab. A cap that loses signal after a few hours suits a clinic visit. Workplace fatigue monitoring, sleep tracking and consumer headsets all need a full day. Companies are taking different routes to that full day. Sabi, which raised a $50 million seed round in October for a brain-sensing baseball cap, designs its sensors to work through hair without gel or skin contact. The Guangxi team keeps the skin contact and makes it last longer.
The test used an off-the-shelf cap, so the electrode could in principle replace the contacts in existing hardware without a new device. China’s national brain-computer interface plan, signed by the Ministry of Industry and Information Technology and six other agencies in July 2025, calls for faster development of self-adjusting non-implanted electrodes that are more convenient, comfortable and easy to use.
Not disclosed
Typing speed is not given in the paper’s summary or its supplementary information. No cost to make the electrode at scale has been published, and no company has been named to make or license it.
Forward Radar: What to watch
Whether the team tests the electrode in people with epilepsy, which would turn the seizure-warning claim into data.
Whether a Chinese EEG maker licenses the design for a cap sold to hospitals or consumers.
Whether all-day wear becomes the selling point that separates consumer EEG products from one another.
Sources
Primary:
- Jiang, Chen et al., Skin-mimetic adaptive gradient electrode for ambulatory noninvasive brain-computer interfaces, npj Flexible Electronics, 31 October 2026
- Supplementary information for the paper, npj Flexible Electronics (PDF)
- Ministry of Industry and Information Technology and six agencies: implementation opinions on promoting innovative development of the brain-computer interface industry, July 2025 (Chinese)
Coverage:
- South China Morning Post: China’s comfortable brain-reading device achieves 94% mind-typing accuracy in day-long use, November 2026
- Kantan.News: Wearable brain-computer interface achieves 94% accuracy throughout the day, 9 November 2026
- Dataconomy: Chinese BCI electrode hits 94% mind-typing accuracy in day-long test, 9 November 2026
Cross-reference to prior InsideBCI coverage: